Lifting-jack.



0/0. MULVIHILL;

LIFTING JAEK. APPLICATION FILED 1 58.23, 1911.

mmswm Patented June 5,1917.

DANIEL C. MULVIHILL, F HANNIBAL, MISSOURI.

LIETING-J'ACK.

To all whom'it may concern:

Be it known that I, DANIEL C. MuLvIHmL,

a citizen of the United States, and a resident of Hannibal, countyofMarion, and State of Missouri, have invented certain new and usefulImprovements in Lifting-Jacks, of which the following is declared to bea full,;clear; and exact description. I

This invention relates to lifting jacks, and its principal object is toprovide a,jack designed especially for use in lifting automobiles.Another object is to provide a jack adapted to be operated by compressedair. Another object is to provide a jack, the ,column or post of whichmay be instantly adjusted with respect to the axle or frame of theautomobile, and thereafter the jack is operated by compressed air. Manyof the I automobiles and other motor'vehicles now in use, are equippedwith an air pump driven by the motor, for inflating the tires;

sufiicient pressure may be developed with such a pump to operate thepresent jack.

The invention consists in the several -novel' features hereinafter fullyset forth and particularly defined in the appended claims.

The invention is clearly illustrated in the drawing, accompanyingthisspecification, which shows a simple embodiment of this invention incentral vertical section.

In the embodiment of the invention illustrated in said drawing, thereference numeral 1, designates a cylinder closed at its lower end by abottom wall 2, which forms open, externally screw threaded upper end,'

a base for thejack. :The cylinder has an which is closed by a'cap 3,having a downwardly extending flange 4,'threaded upon the upper threadedend of the cylinder. The cylinder is provided with a handle 5, by

means of which it may .be handled, and.

the upright" member 6, of said handle and horizontal member 7 areprovided with connected air passageways 8 and 9, leading from the lowerend of the interior of the" cylinder 1. In the passageway 9, is an airvalve 10, of the ordinary check valve type I A employed in pneuInatictires, and said valve opens in the direction of the arrow at, and isarranged to be coupled with a flexible connection that may run to an airpump (not 'ofthe "valve, which cap must be shown) such as is ordinarilyemployedin connection with the motors of automobiles.

have shown a screw threaded cap 11, screwed on the threaded neck of thebody unscrewed v Specification of Letters Patent.

cured to it. "At the upper-endof the pas Patented Jame 5, 1am;Application filed February 23, 1917. Serial No. 150,316.

sageway 8, is a second air'valve 12, which.-

may be of the same construction as the valve 10, and said air valve,opens .in the direction of the arrow 6. Said air valve 12, is screwedinto-theopen internally screw threaded end i" i of the handle 5, and itsprotruding-end may be covered by acap 1 3,'which has threads and isprovided with a discharge aperture plunger stem of the air valve. downupon the-stem 15, the

cylinder, may be permitted to escape.

Within'the. cylinder 1, is a plunger or pis- I ton 16, which is providedwith a tubular '14. stem 15, is guided into the upper end of the cap 13,and engages- With the By pressing air'valve isopened whereby the air,contained in the;

stem 17 guided in a neck 18, formed upon the cover. 3. The plunger orpiston 16, is

provided. with an ordinary cup washer 19,

secured to its lower faceby' a ,disk 20, and

cap screws 21. Whenthe plunger or piston is inits lowermost positioh,the cap screws rest on the bottom or base 2,1.of the cylinder,

and support the piston and its washer away from the bottom ofthelcylinder whereby air may enter the cylinder below the cup washer.Resting upon the upper end of the tubular stem 17, is a nut22, which isthreadd upon a screw threaded post or column 23, that ex- 1 tends downinto the hollow of the tubular stem 17. The upper end of the post ordolurnn 23, is provided with a head or bearing plate 24, which isadapted to be placed underneath the axle or frame of an automobile whenit isdesired to use the jack for the purpose of lifting said end of theframe.

axle or frame of the automobile, and the nut 22, is turned upon thescrew threadedpost or standard 23, to. raise the head orbearing plate24,and bring it into contact'with the underside of the axle or frame.The cap 11, of the air valve 10, is then unscrewed and In use, the jackis placed underneath the the air valve is coupled with the flexiblestopped. To lower the automobile, the stem 65 that engage with the bodyof the valve 12,

15, is depressed, thereby opening the air valve 12, permitting theescape of the compressed air out through the air vent 14, of the cap 13.I More or of construction described is possible, without departing fromthe spirit of this invention; I desire, therefore, not to limit, myselfto the exact form of construction shown and described, but intend in thefollowing claims to point out all of the invention disclosed herein.

, I claim as new, and desire to secure by Letters Patent:

1. A lifting jack comprising a compressed air cylinder, a plungersliding therein and having a tubular stem, a screw threaded postslidably held in said stem, a nut threaded upon said post and restingupon the upper end of the stem, a handle formed integral with saidcylinder and having an air passageway therein, opening to the interiorof the cylinder, and a valve screwed in said handle and opening to thepassageway and adapted for connection with a flexible air connection.

2. A lifting'jackcomprising a compressed air cylinder having a hollowhandle formed integral therewith, the hollow of the handle opening tothe interior of the cylinder, an air valve screwed in the hollow of saidhandle and adapted for connection with a flexible air connection, a capsecured to the upper end of said cylinder, a plunger sliding in saidcylinder and having a tubular stem guided in said cap, a screw threadedpost slidably held in said stem, and a nut threaded upon said post andresting upon the upper end of said stem.

3. A lifting jack comprising a compressed air cylinder closed at thebottom and open less variation of the exact details at the top, a capscrewed upon the open end of said cylinder, a hollow. handle for saidcylinder, the hollow opening to the interior of the cylinder, an airvalve in the hollow of said handle and adapted for connection with aflexible air connection, a plunger sliding in said cylinder and having atubular stem.

guided in said cap, a screw threaded post sliding in said tubular stem,and a nut threaded upon said post and resting upon the upper end of saidstem.

4. A lifting jack comprising a compressed air cylinder having a hollowhandle, the hollow of which communicates with the interior of saidcylinder, an air valve in the hollow of said handle and arranged forconnection with a flexible air connection, a second air valve secured insaid handle and communicating with the hollow thereof, a plungerin saidcylinder and having a tubularstem, a screw threaded post sliding in saidtubular stem, and a nut threaded upon said screw threaded post andresting upon the upper end of said tubular stem.

5. A lifting jack comprising a compressed air cylinder, closed at thebottom and open at the top, a screw threaded cap secured upon the upperopen end of said cylinder, said cylinder being formed with a handlehaving an air passage leading to the interior of the cylinder, an airvalve in said passageway, adapted for connection with a flexible airconnection, a second air valve in said passageway, a plunger sliding insaid cylinder having a tubular stem guided in said cap, a screw threadedpost movable lengthwise in said tubular stem, and a nut threaded uponsaid post and bearing upon the upper end of said tubular stem.

DANIEL C. MULVIHILL.

